Ferrocenediyl-Bridged Triiron Complexes†
Ferrocenediyl-Bridged Triiron Complexes†
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DOI:
10.1021/om0008528
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发表时间:
2001-05
期刊:
影响因子:
2.8
通讯作者:
Lung-Shiang Luh;Y. Wen;G. Vankó;Ling‐Kang Liu
中科院分区:
文献类型:
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作者:
Lung-Shiang Luh;Y. Wen;G. Vankó;Ling‐Kang Liu
The reaction of 2 equiv of CpFe(CO)2I and 1,1‘-dilithioferrocene in the presence of 2 equiv of PPh3 is an intermolecular version of the reaction of CpFe(CO)2I and (η5-C5H4Li)Fe(C5H4PPh2). In the three-component procedure, the PPh3 substitution for iodide on CpFe(CO)2I is much faster than the nucleophilic Fc-addition at the Fe-center or at a CO ligand of CpFe(CO)2I. This one-pot reaction proceeds through [CpFe(CO)2PPh3+] and yields CpFe(CO)(PPh3)[μ,C:η5-C(O)C5H4]Fe[μ,η5:η4-5-exo-(1‘-C5H4)C5H5]Fe(CO)2(PPh3) (4) in 50% yield, with the 1,1‘-dilithioferrocene participating twice in the nucleophilic Fc-additions: at the Cp-ring and at a CO ligand of [CpFe(CO)2PPh3+]. Complex 4 is a ferrocenediyl-bridged tri-Fe complex with three different Fe-centers: a metallocene Fe(II), a square-pyramidal pentacoordinate Fe(0), and a half-sandwich acyl-Fe(II). It has been found that, in the second Fc-additions, the pathway from (η5-C5H4Li)Fe[μ,η5:C-C5H4C(O)]FeCp(CO)(PPh3) (9) to 4 proceeds normally, but the pathway from 9 t...